EP0887430B2 - Support en alliage d'aluminium pour plaque lithographique - Google Patents

Support en alliage d'aluminium pour plaque lithographique Download PDF

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Publication number
EP0887430B2
EP0887430B2 EP97110527A EP97110527A EP0887430B2 EP 0887430 B2 EP0887430 B2 EP 0887430B2 EP 97110527 A EP97110527 A EP 97110527A EP 97110527 A EP97110527 A EP 97110527A EP 0887430 B2 EP0887430 B2 EP 0887430B2
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EP
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Prior art keywords
aluminum alloy
plate
alloy support
less
cold rolling
Prior art date
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Expired - Lifetime
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EP97110527A
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German (de)
English (en)
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EP0887430A1 (fr
EP0887430B1 (fr
Inventor
Mamoru Matsuo
Hirokazu c/o Fuji Photo Film Co. Ltd. Sasaki
Yoshinori C/O Fuji Photo Film Co. Ltd. Hotta
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Sky Aluminium Co Ltd
Fujifilm Corp
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Sky Aluminium Co Ltd
Fujifilm Corp
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Application filed by Sky Aluminium Co Ltd, Fujifilm Corp filed Critical Sky Aluminium Co Ltd
Priority to DE1997623061 priority Critical patent/DE69723061T3/de
Priority to EP97110527A priority patent/EP0887430B2/fr
Publication of EP0887430A1 publication Critical patent/EP0887430A1/fr
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41N—PRINTING PLATES OR FOILS; MATERIALS FOR SURFACES USED IN PRINTING MACHINES FOR PRINTING, INKING, DAMPING, OR THE LIKE; PREPARING SUCH SURFACES FOR USE AND CONSERVING THEM
    • B41N1/00—Printing plates or foils; Materials therefor
    • B41N1/04—Printing plates or foils; Materials therefor metallic
    • B41N1/08—Printing plates or foils; Materials therefor metallic for lithographic printing
    • B41N1/083—Printing plates or foils; Materials therefor metallic for lithographic printing made of aluminium or aluminium alloys or having such surface layers
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C21/00—Alloys based on aluminium

Definitions

  • the present invention relates to an aluminum alloy support for a lithographic printing plate, and particularly to an aluminum alloy support for a planographic printing plate, which is suitable for electrochemical surface roughening and is excellent in fatigue strength and resistance against repeated bending.
  • a planographic printing plate (including an offset form plate) is represented by a so-called PS (Pre-Sensitized) form plate.
  • the PS form plate is produced by a method wherein the surface of an aluminum alloy made base body is roughened, followed by surface treatment such as anode oxidation as needed, and coated with a photosensitive paint and dried.
  • the surface of the PS form plate is generally subjected to image exposure, development, coating of gum, and the like.
  • a photosensitive layer insoluble and remaining on the surface at the development step forms an image portion
  • an area in which the photosensitive layer is removed and the surface of the aluminum layer is exposed at the development step is hydrophilic and forms a non-image portion as a water receptive portion.
  • a base body of such a planographic printing plate is generally formed of an aluminum alloy plate which is lightweight and excellent in surface treatment ability and workability.
  • an aluminum alloy plate which is lightweight and excellent in surface treatment ability and workability.
  • a rolled aluminum alloy plate (thickness: about 0.1-0.5 mm) specified, for example, under JIS A1050, JIS A1100 or JIS A3003.
  • JIS A1050, JIS A1100 or JIS A3003 In the case of such a rolled aluminum alloy plate for a planographic printing plate, it is subjected to surface roughening, followed by anode oxidation as needed.
  • Various aluminum alloy made planographic printing plates have been known. One plate is subjected to mechanical surface roughening, chemical etching, and anode oxidation in this order as described in Japanese Patent Laid-open No.
  • Sho 48-49501 Another plate is subjected to electrochemical treatment, post-treatment, and anode oxidation in this order as described in Japanese Patent Laid-open No. Sho 51-146234 .
  • a further plate is subjected to chemical etching and anode oxidation in this order as described in Japanese Patent Publication No. Sho 48-28123 .
  • An additional plate is subjected to mechanical surface roughening, following by the treatments described in the above document, Japanese Patent Publication No. Sho 48-28123 .
  • a planographic printing plate is produced from an aluminum alloy for a base body by roughening the surface of the plate using either or combination of two kinds or more of mechanical, chemical, and electrochemical surface roughening processes; forming an anode oxide film of 0.5-3 ⁇ m in thickness on the roughened surface for improving printing characteristics; coating the surface with a photosensitive paint and drying the paint; and subjecting the surface of the plate to planographic form-plate preparing treatments such as exposure and development.
  • the form plate thus obtained is wound around a plate cylinder of a printing press with both ends thereof being fixed by mechanical gripping.
  • ink is allowed to adhere on an image portion of the plate form under the presence of dampening water, being transferred on a rubber blanket, and is printed on a paper surface.
  • the printing speed significantly increases with the advance of the printing technique, and to increase the printing speed, there is a tendency to apply a large stress on both ends of a form plate mechanically fixed on a plate cylinder of the printing press.
  • the aluminum alloy form plate is insufficient in strength, both the ends of the form plate fixed to the plate cylinder are deformed or broken, causing a failure such as printing deviation; or the form plate is cut at the grip portions due to stress repeatedly applied to the bending portions at both the ends of the form plate, causing interruption of printing.
  • the uniformly roughened surface and the suitable surface roughness can be obtained by electrochemical surface roughening; and also a non-image portion shows ink repellent property during printing, that is, the water receptivity is excellent.
  • the above aluminum alloy plate is poor in fatigue strength, particularly, in the case where the plate is fixed in the direction perpendicular to the rolling direction, so that there arises a problem that the interruption of printing frequently occurs due to the above-described failure in gripping.
  • EP-A-652 298 discloses an aluminum alloy support for planographic printing plate prepared by a process which comprises subjecting molten aluminum alloy to continuous cast rolling to directly form a tabular plate, followed by cold rolling, heating and correction of the plate, wherein a tensile strength of the aluminum alloy support is 15 kg/mm 2 or more and an offset stress of the aluminum alloy support is 10 kg/mm 2 or more, when a heat treatment is conducted at 300°C for 7 minutes.
  • JP-A-8179496 relates to a presensitized plate with aluminium alloy base, wherein the alloy contains iron, silicon, copper and titanium, and the surface of which is electrochemically roughened with nitric acid.
  • the plate is prepared by homogenizing the aluminum alloy ingot described above, hot-rolling, cold-rolling, annealing, cold-rolling, chemically roughening and forming a photosensitive layer.
  • an object of the present invention is to provide an aluminum alloy support for a lithographic printing plate, which is excellent in both fatigue strength and resistance against repeated bending, particularly, irrespective of the fixed direction against the rolling direction; excellent in suitability for surface roughening (particularly, capable of obtaining a uniformly roughened surface and a suitable surface roughness by electrochemical surface roughening); and excellent in water receptivity.
  • the present inventors have experimentally examined a means for improving the fatigue strength of a JIS A1050 based aluminum alloy excellent in electrochemical surface roughening property and water receptivity, and found that the fatigue strength and resistance against repeated bending are closely related to not only the composition of the alloy but also shapes of crystal grains of the surface of the plate and mechanical properties of the plate.
  • an aluminum alley support for a lithographic printing plate according to claim 1 which is excellent in strength, surface treatment ability, and water receptivity, said aluminum alloy support containing: 0.20-0.50 wt% of Fe, 0.05-0.20 wt% of Si, and 5-300 ppm of Cu, the balance being Al and inevitable impurities, wherein a ratio between the maximum length and the maximum width of each of crystal grains in a micro-surface structure of said aluminum alloy support is within a range of 10 to 30, the support being obtainable as specified in claim 1.
  • an aluminum alloy support for a lithographic printing plate which is excellent in strength, surface treatment ability, and water receptivity
  • said aluminum alloy support containing: 0.20-0.50 wt% of Fe, 0.05-0.20 wt% of Si, and 5-300 ppm of Cu, the balance being Al and inevitable impurities, wherein a ratio between the maximum length and the maximum width of each of crystal grains in a micro-surface structure of said aluminum alloy support is within a range of 10 to 30, and the yield strength of said aluminum alloy support is within a range of 145 to 190 N/mm 2 , the fatigue strength thereof is within a range of 4 ⁇ 10 4 or more, and the number of repetitions of bending thereof is 8 times or more, the support being obtainable as specified in claim 2.
  • the content of Si is less than 0.05 wt%, the surface treatment ability is poor, and thereby the uniformity of the roughened surface obtained by electrochemical surface roughening is deteriorated.
  • it is more than 0.20 wt%, the tone of the surface after surface roughening is excessively blackened resulting in the lost commercial value, and also the uniformity of the roughened surface is reduced and the water receptivity is reduced. Accordingly, the content of Si is required to be within a range of 0.05 to 0.20 wt%.
  • the content of Fe is required to be within a range of 0.20 wt% to 0.50 wt%.
  • Cu is an element of making fine pits generated by electrochemical surface roughening, thereby improving the surface treatment ability.
  • the content of Cu is less than 5 ppm (0.0005 wt%), the effect of making fine the pits is insufficient.
  • it is more than 300 ppm (0.03 wt%) the uniformity of the roughened surface by electrochemical surface roughening is reduced and also the water receptivity is reduced. Accordingly, the content of Cu is required to be within a range of from 5 to 300 ppm.
  • the balance may be basically Al and inevitable impurities.
  • a small amount of Ti is sometimes added singly or in combination with a trace of B for refinement of the crystal structure of the ingot thereby improving the texture of the rolled plate and preventing occurrence of streaks thereof.
  • 0.003-0.05 wt% of Ti may be added singly or in combination with 1-50 ppm of B.
  • the content of Ti is less than 0.003 wt% or the content of B is less than 1 ppm, the above effect cannot be achieved.
  • the amount of impurities may be set to be within ranges specified under JIS 1050 (Mn: 0.05 wt% or less, Mg: 0.05 wt% or less, Zn: 0.05 wt% or less, and the other elements: 0.05 wt% or less).
  • the aluminum alloy support of the present invention used for a base body of the planographic printing plate is required to have the number of repetitions of bending in a range of 8 times or more and the fatigue strength in a range of 4 ⁇ 10 4 or more.
  • the number of repetitions of bending and fatigue strength described above not only the composition of the plate but also shapes of crystal grains in micro-surface structure of the plate must be suitably adjusted. More specifically, a ratio between the maximum length and the maximum width (so called aspect ratio) of each of crystal grains of the surface of the plate is required to be within a range of 10 to 30.
  • the fatigue strength improves the fatigue strength to a value of 4 ⁇ 10 4 or more.
  • the aspect ratio is less than 6, a sufficient fatigue strength cannot be obtained; while when it is more than 30, the resistance against repeated bending is reduced, that is, the number of repetitions of bending is difficult to be stably more than 8 times.
  • the yield strength exerts an effect on the fatigue strength.
  • the fatigue strength is compatible with the resistance against repeated bending.
  • the yield strength is less than 145 N/mm 2
  • the fatigue strength is less than 4 ⁇ 10 4
  • the resistance against repeated bending is reduced and it is difficult for the number of repetitions of bending to exceed 8 times, that is, the target number specified in the present invention.
  • the aspect ratio of each of crystal grains of the micro- surface structure is required to be within a range of 10 to 30, and the yield strength is required to be within a range of 145 to 190 N/mm 2 .
  • the number of repetitions of bending is evaluated by a manner of repeatedly performing 90° bending right and left by a pressing bend method, and counting the number of bending until there occur cracks at the bending portion as the number of repetitions of bending. In this case, the number of bending is counted for each 90° bending, that is, for not only 90° forward bending but also 90° backward (return) bending after 90° forward bending.
  • the fatigue strength is evaluated by a manner of repeatedly applying a tensile load of 5 kg/mm 2 at a frequency of 25 Hz on one end of a test piece bent at 30° at a corner of 2 mmR, and counting the number of repetitions of applied load until the test piece is fractured. That is, the fatigue strength is expressed by the number of repetitions of applied load.
  • the molten metal of the aluminum alloy having the above-described composition is cast by a known process.
  • An ingot thus obtained is heated and is subjected to hot rolling, followed by cold rolling, to be formed into a plate of 0.10 to 0.50 mm in thickness.
  • hot rolling and cold rolling steps at least a surface layer of the rolled plate is required to be recrystallized at least one time in a period from the ending of hot rolling to completion of cold rolling.
  • the rolled plate may be recrystallized at the ending of hot rolling by making use of the ending temperature of hot rolling; or it may be subjected to recrystallization annealing in a period after hot rolling and before cold rolling or in the midway of cold rolling.
  • the ending temperature of hot rolling is preferably set at a value of 280°C or more.
  • recrystallization annealing is performed in a period after hot rolling and before cold rolling or in the midway of cold rolling, it is preferably performed at a temperature of 280 to 450°C for a time of 0.5 to 24 hr for batch annealing, and performed at a temperature of 350 to 600°C for a time of 0 to 5 min for continuous annealing.
  • the reduction ratio of the plate in cold rolling after recrystallization is set at a value of 80 to 95%.
  • an aspect ratio of each of crystal grains of the surface of the rolled plate is easily adjusted to be within a range of 10 to 30 and also a yield strength of the rolled plate is easily adjusted to be within a range of 145 to 190 N/mm 2 .
  • the reduction ratio of the plate in cold rolling after recrystallization is less than 80%, the aspect ratio tends to be less than 6 and the yield strength is difficult to be stably more than 145 N/mm 2 ; while when it is more than 95%, the aspect ratio possibly exceeds 30.
  • the surface of the aluminum alloy support is preferably cleaned with trichloroethylene, sodium hydroxide or the like for removing fat and oil, rust, contamination, and the like adhering on the surface.
  • trichloroethylene, sodium hydroxide or the like for removing fat and oil, rust, contamination, and the like adhering on the surface.
  • the desmutting treatment is performed by, for example, dipping the plate in a sulfuric acid or nitric acid of 10 to 30 wt%.
  • the surface thus cleaned is then roughened by a mechanical surface roughening process, electrochemical surface roughening process, or chemical surface roughening process.
  • the mechanical surface roughening process is represented by a brush grain process using a rotating nylon brush and abrasives (alumina, silica sand, or the like).
  • the electrochemical surface roughening process is generally performed by electrolyzing the surface of the plate in a solution containing hydrochloric acid or nitric acid in an amount of 2-40 g/l at a temperature of 20 to 70°C.
  • the electrolytic solution may contain an aluminum salt of the above acid, inorganic acid, amine, carboxylic acid, and the like.
  • the waveform of a current used for the electrolytic surface roughening may include a commercial A. C., sine wave A. C, rectangular wave, parallelopiped wave, and the like.
  • the current density is preferably set to be within a range of 10 to 100 A/mm 2 .
  • the roughened surface state obtained by electrolytic surface roughening can be adjusted by control of requirements such as the composition and temperature of electrolytic solution; density, waveform, and amount of a current used for electrolysis; and the flow rate of electrolytic solution. As a result, it is possible to easily obtain desired printing characteristics by suitably controlling these requirements.
  • the chemical surface roughening process is performed by etching the surface of the plate with sodium hydroxide, sodium fluoride or the like.
  • the residue adhering on the surface thus roughened can be removed by a process described in USP 3,834,998 . It is to be noted that either of the processes described above may be basically used for surface roughening; however, the electrochemical surface roughening process is particularly preferable for the aluminum alloy having the composition specified in the present invention.
  • the surface of the aluminum alloy support which has been roughened as described above, is then subjected to anode oxidation by a known process.
  • the anode oxidation may be performed in an electrolytic solution of sulfuric acid, phosphoric acid, oxalic acid, chromic acid, amidosulfonic acid, or the like containing an aluminum salt using direct current, alternating current, superimposed alternating current on direct current, pulsed direct current, or the like.
  • the concentration of the electrolytic solution may be within a range of 1 to 80 wt%; the temperature thereof may be within a range of 5 to 70°C; the current density may be within a range of 0.5 to 60 A/dm 2 ; and the weight of an oxide film may be within a range of 0.5 to 5 g/m 2 .
  • the aluminum alloy support which has been subjected to anode oxidation, may be subjected to hydrophilic treatment by a method described in USP 2,714,066 , GB 1,203,447 , or USP 3,181,461 . Further, the aluminum alloy support may be formed, as needed, with an under coat layer in an amount of 5 to 30 mg/m 2 using an organic sulfonic acid (described in Japanese Patent Laid-open No. Sho 63-145092 ); a compound containing carboxylic acid and a phosphoric acid group (described in Japanese Patent Laid-open No. Sho 63-145092 ); a compound containing one amino group and one oxygen acid group of phosphorus (described in Japanese Patent Laid-open No. Hei 3-261592 ); or a phosphate (described in Japanese Patent' Laid-open No. Hei 3-215095).
  • an organic sulfonic acid described in Japanese Patent Laid-open No. Sho 63-145092
  • the surface of the aluminum alloy support is required to be provided with a photosensitive layer.
  • the photosensitive layers may include the following layers (1) to (4).
  • diazo resin of a condensate of P-diazophenylamine and formaldehyde or acetaldehyde and hexafluorophosphate there may be desirably used a diazo resin of a condensate of P-diazophenylamine and formaldehyde or acetaldehyde and hexafluorophosphate, and diazo compounds described in USP 3,300,309 and Japanese Patent Laid-open No. Sho 54-19773 .
  • photodimerization type photosensitive layer compositions may include polymers each having a maleimide group at a side chain or main chain described in USP 4,078,041 and DE 2,626,769 .
  • photopolymerization photosensitive layer compositions may include polymers each having a cinnamyl group, cinnamoyl group or chalcone group at a side chain or main chain.
  • a photosensitive polyester described in USP 3,030,208 or 828,455 is used as the photopolymerization photosensitive layer composition.
  • ZnO photosensitive layers for electrophotography which are described in USP 3,001,872 , and Japanese Patent Laid-open Nos. Sho 56-161550 , Sho 60-186847, and Sho 61-238063.
  • Each of the above-described photosensitive layers may be added with, as needed, a binder described in USP 4,028,111 or 3,751,257 ; a dye described in Japanese Patent Laid-open No. Sho 62-293247 ; an affinitizing agent described in Japanese Patent Laid-open No. Sho 55-527 and Hei 2-96756 ; a non-ionic surface-active agent described in Japanese Patent Laid-open No. Sho 62-251740 ; and a photooxidizing agent for visualizing an image after exposure represented by O-naphthoquinonediazido-4-sulfonyl chloride or trihalomethyloxathiazole, which is described in Japanese Patent Laid-open Nos. Sho 53-36223 or Sho 63-58440 .
  • the photosensitive layer may be formed on the aluminum alloy support in an amount (weight after drying) of 0.8 to 6 g/m 2 .
  • a mat layer composed of independent projections may be provided on the photosensitive layer thus coated on the surface of the aluminum alloy support, as described in Japanese Patent Laid-open Nos. Sho 55-12974 and Sho 58-182636 . Further, there may be adopted a method of covering the back surface opposed to the surface coated with the photosensitive layer, with a polymer having a glass transition point of 20°C or more, or an inorganic oxide obtained from an organic metal salt by hydrolysis or the like (described in Japanese Patent Laid-open No. Hei 6-35174 ).
  • the photosensitive planographic printing plate (PS form plate) thus produced is subjected to exposure of image, followed by development and coating of gum in accordance with a process described in each of USP 4,259,434 and 4,186,006 , and Japanese Patent Laid-open Nos. Sho 59-84241 , Sho 57-192952 and Sho 62-24263 , and is fixed on a plate cylinder for printing.
  • An aluminum alloy having a chemical composition shown in Table 1 was melted and was semi-continuously cast into an ingot of 450 mm ⁇ 1200 mm ⁇ 3500 mm in size. Each surface portion of the ingot was cut off to a depth of 10 mm. The ingot was subjected to soaking, as needed. Then, the ingot was hot-rolled, followed by cold rolling, to be formed into a raw plate (thickness: 0.3 mm) for a base body of a planographic printing plate. In addition, if necessary, the rolled plate was subjected to intermediate annealing in the midway of the cold rolling. The detailed production conditions are shown in Table 2. Table 1 alloy No.
  • the brush grain treatment was performed in a suspension of purmice/25 wt% of water using a rotating nylon brush.
  • the surface of the raw plate was subjected to preliminary etching in a solution of 10% sodium hydroxide in a condition of 50°C ⁇ 1 min, followed by electrolytic surface roughening for 10 sec in a solution of 1% nitric acid at a current density of 30 A/mm 2 .
  • the surface of the raw plate was cleaned in a solution of 5% sodium hydroxide in a condition of 35°C ⁇ 10 sec, followed by neutralization in 30% sulfuric acid in a condition of 50°C ⁇ 20 sec.
  • the surface of the plate thus treated was then subjected to anode oxidation in 15% sulfuric acid.
  • An anode oxide film was formed to a thickness of about 0.7 ⁇ m.
  • the following photosensitive layer was provided on the surface of the aluminum alloy support in an amount (weight after drying) of 2 g/m 2 .
  • the photosensitive aluminum alloy support thus obtained was exposed to light emitted from a metal halide lamp of 3 kw disposed separately from the plate at a distance of 1 m for 50 sec.
  • the resultant plate was subjected to development in a solution of 3% meta-sodium silicate at 25°C for 45 sec, followed by water-washing and drying, and was coated with gum, to obtain a planographic printing plate.
  • the original form plate thus obtained was mounted on a printing press, and was subjected to printing test.
  • the fatigue strength in Table 3 was evaluated by a method of repeatedly applying a tensile load of 5 kg/mm 2 at a frequency of 25 Hz onto one end of a test piece which was bent at an angle of 30° at a corner of 2 mmR and counting the number of repetitions of applied load until the test piece was fractured.
  • the measurement of the fatigue strength was performed along two directions, a (longitudinal) direction parallel to the rolling direction and a (transverse) direction perpendicular to the rolling direction. The fatigue strength over 40,000 times is decided to be preferable.
  • the number of repetitions of bending in Table 3 was evaluated by a method of holding a test piece between pedestals of 1 mmR, repeatedly bending the test piece right and left with the inner curvature of the bending portion set at 1 mmR, and counting the number of repetitions of bending for each 90° bending until the test piece was fractured.
  • the measurement of the number of repetitions of bending was also performed along two directions, a (longitudinal) direction parallel to the rolling direction and a (transverse) direction perpendicular to the rolling direction.
  • the number of repetitions of bending over 8 times is decided to be preferable.
  • the aspect ratio of crystal grains of the surface was measured using a photograph having a magnification of 25 times. Table 3 production No. alloy No.
  • the aluminum alloy support for a lithographic printing plate according to the present invention provides a form plate excellent in both fatigue strength and resistance against repeated bending even in the directions parallel and perpendicular to the rolling direction (which means that the form plate can be used in a state being disposed in either the longitudinal or transverse direction with respect to the rolling direction), and also excellent in surface treatment ability and water receptivity.
  • the raw plates of Comparative Examples cannot satisfy the requirements specified in the present invention.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Printing Plates And Materials Therefor (AREA)

Claims (2)

  1. Un support en alliage pour une plaque d'impression lithographique, qui est excellent en résistance, à l'aptitude au traitement de surface et en réceptivité à l'eau, ledit support en alliage d'aluminium contenant :
    0,20-0,50 % en poids de Fe,
    0,05-0,20 % en poids de Si,
    5-300 ppm de Cu, et en option
    0,003-0,05 % en poids de Ti ou 0,003-0,05 % en poids de Ti en combinaison avec 1-50 ppm de B,
    le complément étant Al et les impuretés inévitables, qui sont fixées pour être dans les intervalles de
    0,05 % en poids ou moins de Mn,
    0,05 % en poids ou moins de Mg,
    0,05 % en poids ou moins de Zn, et
    0,05 % en poids ou moins d'autres impuretés,
    caractérisé en ce que le rapport entre la longueur maximale et la largeur maximale de chaque grain de cristal dans une structure de micro-surface dudit support en alliage d'aluminium se situe dans l'intervalle de 10 à 30,
    pouvant être obtenu en moulant le métal fondu de l'alliage d'aluminium ayant la composition donnée ci-dessus, en chauffant le lingot résultant, en soumettant le lingot à un laminage à chaud puis ensuite à un laminage à froid, et en recristallisant une surface du produit laminé pendant une période à partir de la fin du laminage à chaud jusqu'à la fin du laminage à froid pour former une plaque de 0,10-0,50 mm d'épaisseur avec rapport de réduction de la plaque par le laminage à froid après recristallisation de 80 à 95%.
  2. Un support en alliage pour une plaque d'impression lithographique, qui est excellent en résistance, à l'aptitude au traitement de surface et en réceptivité à l'eau, ledit support en alliage d'aluminium contenant :
    0,20-0,50 % en poids de Fe,
    0,05-0,20 % en poids de Si,
    5-300 ppm de Cu, et en option
    0,003-0,05 % en poids de Ti ou 0,003-0,05 % en poids de Ti en combinaison avec 1-50 ppm de B,
    le complément étant Al et les impuretés inévitables, qui sont fixées pour être dans les intervalles de
    0,05 % en poids ou moins de Mn,
    0,05 % en poids ou moins de Mg,
    0,05 % en poids ou moins de Zn, et
    0,05 % en poids ou moins d'autres impuretés,
    caractérisé en ce que le rapport entre la longueur maximale et la largeur maximale de chaque grain de cristal dans une structure de micro-surface dudit support en alliage d'aluminium se situe dans l'intervalle de 10 à 30,
    la résistance à la déformation dudit support en alliage d'aluminium se situe dans un intervalle de 145 à 190 N/mm2, la résistance à la fatigue de celui-ci se situe dans un intervalle de 4 x 104 ou plus, et le nombre de répétitions de pliage de celui-ci est de 8 fois ou plus,
    pouvant être obtenu en moulant le métal fondu de l'alliage d'aluminium ayant la composition donnée ci-dessus, en chauffant le lingot résultant, en soumettant le lingot à un laminage à chaud puis ensuite à un laminage à froid, et en recristallisant une surface du produit laminé pendant une période à partir de la fin du laminage à chaud jusqu'à la fin du laminage à froid pour former une plaque de 0,10-0,50 mm d'épaisseur avec un rapport de réduction de la plaque par le laminage à froid après recristallisation de 80 à 95%.
EP97110527A 1997-06-26 1997-06-26 Support en alliage d'aluminium pour plaque lithographique Expired - Lifetime EP0887430B2 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE1997623061 DE69723061T3 (de) 1997-06-26 1997-06-26 Träger aus einer Aluminiumlegierung für eine lithographische Druckplatte
EP97110527A EP0887430B2 (fr) 1997-06-26 1997-06-26 Support en alliage d'aluminium pour plaque lithographique

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Application Number Priority Date Filing Date Title
EP97110527A EP0887430B2 (fr) 1997-06-26 1997-06-26 Support en alliage d'aluminium pour plaque lithographique

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EP0887430A1 EP0887430A1 (fr) 1998-12-30
EP0887430B1 EP0887430B1 (fr) 2003-06-25
EP0887430B2 true EP0887430B2 (fr) 2009-06-24

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Publication number Priority date Publication date Assignee Title
EP1033261A3 (fr) 1999-03-03 2003-03-26 Fuji Photo Film Co., Ltd. Plaque d'impression planographique, rouleau avec textile non-tissé et procédé et dispositif pour le pré-polissage de plaques métalliques pour plaques lithographiques
JP2002307849A (ja) 2001-02-09 2002-10-23 Fuji Photo Film Co Ltd 平版印刷版原版
GB2379669B (en) 2001-09-12 2005-02-16 Alcan Int Ltd Al alloy for lithographic sheet
WO2006134542A2 (fr) * 2005-06-15 2006-12-21 Hulett Aluminium (Proprietary) Limited Alliage d'aluminium et procede de production d'un alliage
ES2407655T5 (es) 2007-11-30 2023-02-23 Speira Gmbh Banda de aluminio para soportes para planchas de impresión litográfica y su producción
JP4880664B2 (ja) 2007-12-28 2012-02-22 株式会社神戸製鋼所 パルスレーザ溶接用アルミニウム合金材及び電池ケース

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EP0193710A2 (fr) † 1985-03-02 1986-09-10 Vereinigte Aluminium-Werke Aktiengesellschaft Feuille en aluminium pour l'impression offset et son procédé de fabrication
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DE3232810A1 (de) † 1981-09-03 1983-03-10 Furukawa Aluminum Co., Ltd., Tokyo Druckplatte aus aluminiumlegierung und verfahren zu ihrer herstellung
EP0193710A2 (fr) † 1985-03-02 1986-09-10 Vereinigte Aluminium-Werke Aktiengesellschaft Feuille en aluminium pour l'impression offset et son procédé de fabrication
US5562784A (en) † 1993-12-13 1996-10-08 Nippon Light Metal Company, Ltd. Aluminum alloy substrate for electrolytically grainable lithographic printing plate and process for producing same

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EP0887430A1 (fr) 1998-12-30
DE69723061D1 (de) 2003-07-31
DE69723061T3 (de) 2010-06-10
DE69723061T2 (de) 2004-04-29
EP0887430B1 (fr) 2003-06-25

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